From memory, I think the bases were 16mm steel washers. For human-sized figures I use 12.5mm (1/2") washers. I designed and printed the sabot base myself on my Ender3 FDM printer.
My Barbarica are singly based on US pennies. I can do the battle for Arnold Conan's village to scale!
Thanks for the feedback all. I'm still hesitant to do multi-basing because I feel it locks the models into army/large-skirmish style games and they would be unable to be used for something like Rangers of Shadow Deep.
Still...maybe that's ok. Maybe I do 15mm Lion/Dragon Rampant on multi-base simply because it would be unlike any of my other projects and make it unique within my collection.
Hobgoblin - You're insight and experience with 1/72 has been very helpful in years past, so I gotta ask now... what are your thoughts on 1/72 vs 15mm fantasy?
I am currently using 20mm Renedra bases for 15mm figures.
(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhT7G6d_HrsJeFDaD7cj4QIv3kiLZF5FNHVCZHn6sHwQ2kbYXXGUl69TULK50BQ30IofRWTe4xOAEaw-wJCqzr5keYX8QeIX7bSA3XRrN8Dn-hN-FAdXEtli1P_1dbeMSTI7dnCIK2AzPEWZTTjS2Qb5NMD0s13LapB8_kDutFZC48_Xzh9eA9V0Uw0wSbt/s500/dennis-6.png)
GZG Moongrunt Chinese PSF.